221265231 has 16 divisors (see below), whose sum is σ = 322133760. Its totient is φ = 133977920.

The previous prime is 221265227. The next prime is 221265257. The reversal of 221265231 is 132562122.

It is a cyclic number.

It is not a de Polignac number, because 221265231 - 2² = 221265227 is a prime.

It is a super-2 number, since 2×221265231² = 97916604898966722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221265211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44950 + ... + 49628.

It is an arithmetic number, because the mean of its divisors is an integer number (20133360).

Almost surely, 2^221265231 is an apocalyptic number.

221265231 is a deficient number, since it is larger than the sum of its proper divisors (100868529).

221265231 is a wasteful number, since it uses less digits than its factorization.

221265231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6126.

The product of its digits is 1440, while the sum is 24.

The square root of 221265231 is about 14874.9867562966. The cubic root of 221265231 is about 604.8361289210.

The spelling of 221265231 in words is "two hundred twenty-one million, two hundred sixty-five thousand, two hundred thirty-one".